DeviceIOControl, USB, and cameras

I have a generic USB camera with a driver that supports the DirectShow
program AmCAP. I want to tell the camera to send me an image. I want to do
this with a DeviceIOControl call.

Now somewhere there must be a standard command code that is passed to the
driver from DirectShow to tell it it to send data. How do I find out what
that standard command code is?

In other words, if I wanted to write a driver that fit the DirectShow
standard, where would I find this list of control codes?

I don't even know where to start looking.

Thanks,
- MCP
yahzi@xxxxxxx



.

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